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Important This document may not represent best practices for current development, links to downloads and other resources may no longer be valid. Current recommended version can be found here.

_logb 

Extracts an exponential value of a double-precision floating-point argument.


double _logb(
   double x 
);

Parameters

x

Double-precision floating-point value.

_logb returns the unbiased exponential value of x.

The _logb function extracts the exponential value of its double-precision floating-point argument x, as though x were represented with infinite range. If the argument x is denormalized, it is treated as if it were normalized.

Input SEH exception Matherr exception

± QNAN,IND

None

_DOMAIN

± 0

ZERODIVIDE

_SING

Routine Required header Compatibility

_logb

<float.h>

ANSI, Windows 95, Windows 98, Windows 98 Second Edition, Windows Millennium Edition, Windows Millennium Edition, Windows NT 4.0, Windows 2000, Windows XP Home Edition, Windows XP Professional, Windows Server 2003

For more compatibility information, see Compatibility in the Introduction.

Libraries

All versions of the C run-time libraries.

Not applicable. To call the standard C function, use PInvoke. For more information, see Platform Invoke Examples.

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